Which is better, mechanical at BITS Pilani Hyderabad or ECE at NIT Calicut?

Both the colleges are really good and come with their own tags. In one, you will have the NITian tag and the other will give you a BITS tag. In the end, you will have to make a choice between the branch and which one you like more.

If you are interested in coding and electronics, ECE will be a good fit for you. If you are good with fluid mechanics, thermodynamics and like hands-on work with machines, mechanical is another really good option.

With ECE, you will probably end up working in core firms that are IT-based. You should figure out what kind of life you are looking for and what field you want to study.